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DE4307262A1 - Magnetic polymeric silicon dioxide - Google Patents

Magnetic polymeric silicon dioxide

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Publication number
DE4307262A1
DE4307262A1 DE4307262A DE4307262A DE4307262A1 DE 4307262 A1 DE4307262 A1 DE 4307262A1 DE 4307262 A DE4307262 A DE 4307262A DE 4307262 A DE4307262 A DE 4307262A DE 4307262 A1 DE4307262 A1 DE 4307262A1
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magnetic
silicon dioxide
silica
compounds
dioxide compounds
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Christian Bergemann
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    • B82Y25/00—Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
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    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
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    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
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    • H01F1/0045—Zero dimensional, e.g. nanoparticles, soft nanoparticles for medical/biological use
    • H01F1/0063—Zero dimensional, e.g. nanoparticles, soft nanoparticles for medical/biological use in a non-magnetic matrix, e.g. granular solids

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  • Silicon Compounds (AREA)

Abstract

Process for the preparation of magnetic polymeric silicon dioxide compounds in the form of silica gel, silica sol, precipitated or pyrogenic silicon dioxide, by incorporation of magnetic materials into their matrix. The many possible applications in the sectors of process technology, chemical technology, analysis, biotechnology and pharmacy result from the possibility of influencing such compounds magnetically.

Description

Polymeres Siliciumdioxid in Form von Kieselgelen, Kieselsolen und gefällten oder pyrogenen Silicium­ dioxid findet zahlreiche Anwendungsgebiete in der Verfahrenstechnik, der chemischen Technologie und Pharmazie.Polymeric silica in the form of silica gels, Silica sols and precipitated or pyrogenic silicon Dioxide finds numerous areas of application in process engineering, chemical technology and pharmacy.

Bedingt durch die hohe Absorptionsfähigkeit, die große Oberfläche und chemische Stabilität wird Siliciumdioxid als Katalysatorträger, zum Reinigen oder Trennen von Flüssigkeiten und Gasen, zum Binden chemischer Substanzen, zum Trocknen von Gasen oder Flüssigkeiten sowie als Träger von Arzneistoffen verwendet.Due to the high absorbency, the large surface area and chemical stability Silicon dioxide as a catalyst carrier, for cleaning or separating liquids and gases, for Binding chemical substances, for drying Gases or liquids and as a carrier of Drugs used.

Eine magnetische Beeinflussung im Sinne eines Ein- oder Austrages, Steuerung, Positionierung oder separieren von polymerem Siliciumdioxid würde die Anwendung und Handhabung verfahrenstechnischer, chemischer, analytischer oder pharmazeutischer Vorgänge verbessern oder erst ermöglichen.A magnetic influence in the sense of a Entry or exit, control, positioning  or would separate polymeric silica the application and handling of process engineering, chemical, analytical or pharmaceutical Improve processes or enable them first.

Erfindungsgemäß wird deshalb vorgeschlagen, in die Matrix polymerer Siliciumdioxidverbindungen magnetische Materialen einzubinden.According to the invention it is therefore proposed in the matrix of polymeric silicon dioxide compounds to incorporate magnetic materials.

Fällungskieselsäuren und Kieselgele, denen hinsicht­ lich des Produktionsumfanges die größte Bedeutung zukommt, werden aus wäßrigen Alkalisilikatlösungen durch Fällung und Kondensation mit Mineralsäuren hergestellt.Precipitated silicas and silica gels, which respects most important in terms of production volume comes from aqueous alkali silicate solutions by precipitation and condensation with mineral acids produced.

Erfindungsgemäß wird vorgeschlagen, in Alkalisilikat­ lösungen wie z. B. Natrium-, Kalium- oder Aluminium­ silikatlösungen magnetische Materialen wie Fe, αFe2O3, γFe2O3 oder Fe3O4 zu dispergieren oder als kolloidale Lösungen hinzuzugeben und die Fällung sowie die Kondensation mit Mineralsäuren oder Kohlendioxid vorzunehmen.According to the invention, it is proposed to use solutions such as e.g. B. sodium, potassium or aluminum silicate solutions to disperse magnetic materials such as Fe, α Fe 2 O 3 , γ Fe 2 O 3 or Fe 3 O 4 or to add them as colloidal solutions and to carry out the precipitation and condensation with mineral acids or carbon dioxide.

Auch können die magnetischen Eisenoxide in Mineral­ säuren gelöst und diese dann zur Fällung und Konden­ sation verwendet werden.Also, the magnetic iron oxides in mineral acids dissolved and then for precipitation and condensation sation can be used.

Die mit diesen Methoden in die Alkalisilikatlösungen eingebrachten magnetischen Materialen werden nach Beendigung der Kondensation fest in die Matrix des entstandenen polymeren Siliciumdioxids eingebun­ den.Those with these methods in the alkali silicate solutions Magnetic materials that have been brought in are Termination of condensation firmly in the matrix of the resulting polymeric silicon dioxide the.

Überschüssige, also nicht in der Matrix des Silicium­ dioxids befindlichen magnetische Partikel können durch filtrieren oder zentrifugieren vom Produkt abgetrennt werden.Excess, not in the silicon matrix Magnetic particles located in dioxides can by filtering or centrifuging the product be separated.

Magnetische Kieselsole werden aus in Alkalisilikat­ lösungen dispergierten magnetischen Partikeln oder durch Zugabe kolloidaler magnetischer Lösungen und anschließender Kondensation durch Behandeln mit Kationentauscher hergestellt. Auch durch die Zugabe von Mineralsäuren zu derar­ tigen, mit magnetischen Materialen versetzten Alkalisilikatlösungen und deren Wasserentzug durch wasserlösliche organische Lösungsmittel wie z. B. Äthanol oder Atzeton könne ebenfalls magnetische Kieselsole hergestellt werden. Durch filtrieren, dialysieren oder zentrifugieren werden die magnetischen Kieselsole von überschüssigen magnetischen Materialen, Lösungsmitteln und Salzen gereinigt.Magnetic silica sols are made from alkali silicate solutions dispersed magnetic particles  or by adding colloidal magnetic solutions and subsequent condensation by treatment made with cation exchanger. Also by adding mineral acids to derar with magnetic materials Alkali silicate solutions and their water removal through water-soluble organic solvents such as B. Ethanol or acetone can also be magnetic Silica sols are produced. By filtering, dialyzing or centrifuging the magnetic silica sols from excess magnetic materials, solvents and salts cleaned.

Pyrogene magnetische Kieselsäure wird durch die gemeinsame Verdüsung von Siliciumtrachlorid mit magnetischen Suspensionen oder kolloidalen magne­ tischen Lösungen in einer Wasserstoffflamme herge­ stellt.Magnetic fumed silica is produced by the common atomization of silicon trachloride with magnetic suspensions or colloidal magne table solutions in a hydrogen flame poses.

Die dem polymeren Siliciumdioxid spezifische Ober­ fläche von 30-800 m2/g und die darauf befindlichen Silanol-(-SiOH) und Siloxan-(Si-O-Si) -Gruppierungen, die die Chemisorption über Wasserstoffbrückenbindung ermöglichen, werden durch die Matrixeinbindung magnetischer Substanzen nicht beeinträchtigt.The surface of 30-800 m 2 / g specific to the polymeric silicon dioxide and the silanol (- SiOH) and siloxane (Si-O-Si) groupings on it, which enable chemisorption via hydrogen bonding, become more magnetic due to the matrix integration Substances not affected.

Da vornehmlich über die Wasserstoffbrückenbindung zwischenmolekulare Verbindungen und Assoziierungen mit Molekülen der Gruppen -OH, - COOH, =NH, und -NH3 auftreten, können durch geeignete Maßnahmen wie des vollständigen oder teilweisen Ersatzes durch Alkylsilylreste, so z. B. mit Chlorsilane, andere Bindungsaffinitäten erzielt sowie der hydro­ phile oder hydrophobe Charakter variiert werden. Since intermolecular compounds and associations with molecules of the groups -OH, - COOH, = NH, and -NH 3 occur primarily via the hydrogen bond, suitable measures such as the complete or partial replacement by alkylsilyl radicals, such as e.g. B. achieved with chlorosilanes, other binding affinities and the hydro phile or hydrophobic character can be varied.

Das erfindungsgemäße magnetische polymere Silicium­ dioxid in Form von Kieselgel, Kieselsol und pyrogener oder Fällungskieselsäure ermöglicht neue oder verbesserte Anwendungen.The magnetic polymeric silicon according to the invention dioxide in the form of silica gel, silica sol and pyrogenic or precipitated silica enables new or improved applications.

So können die zur Reinigung oder Trennung von Flüssigkeiten oder Gasen, wie z. B. die Entfernung von Aromaten aus Paraffinen oder der Öldampfabsorp­ tion, beladenen magnetischen Siliciumdioxidverbin­ dungen mit Hilfe externer Magnetfelder oder Magnet­ separatoren vorteilhaft ausgetragen werden.So you can for cleaning or separation of Liquids or gases, such as B. distance of aromatics from paraffins or the oil vapor absorber tion, loaded magnetic silica compound with the help of external magnetic fields or magnets separators are advantageously carried out.

Die Gewinnung und der Austrag von Produkten sowie die Magnetisierung von Bakterien oder Pilzen im Bereich der Biotechnologie, der biologischen Abwasser und Luftreinigung, können durch magnetisches Silici­ umdioxid ermöglicht oder verbessert werden.The extraction and discharge of products as well the magnetization of bacteria or fungi in the Field of biotechnology, biological wastewater and air cleaning, can be done by magnetic silicon dioxide made possible or improved.

Durch magnetische Kräfte, die auf die als Katalysa­ torträger verwendeten magnetischen Siliciumdioxid­ partikel einwirken, kann ein ungewollter Austrag verhindert, aber auch die Verteilung oder eine lokale Anreicherung der Katalysatoren, wie sie z. B. für Oxo-Prozesse oder Hydrierungen Anwendung finden, erzielt werden.By magnetic forces acting on the catalytic converter Magnetic silica used for the door support particles can cause an unwanted discharge prevented, but also the distribution or one local enrichment of the catalysts as they e.g. B. for oxo processes or hydrogenations application find, be achieved.

Die Schüttdichte der magnetischen Siliciumdioxidpar­ tikel in Abhängigkeit von Strömungs- oder Druckver­ hältnissen sowie Gas- oder Flüssigkeitszusammen­ setzungen, kann sowohl für die beschriebenen Anwen­ dungen als auch für die Trocknung von Gasen und Flüssigkeiten durch externe Magnetfelder den jewei­ ligen Betriebsbedingungen angepaßt werden.The bulk density of magnetic silica par particles depending on flow or pressure ver relationships as well as gas or liquid together settlements, can be used for the described applications as well as for drying gases and Liquids from external magnetic fields current operating conditions.

Die Aufnahme von magnetischem Siliciumdioxid, das zur Bindung von chemischen Kontaminationen wie Giften, Säuren, Basen und Mineralölen ausgebracht wird, kann vorteilhaft mit magnetischen Separatoren erfolgen. The absorption of magnetic silicon dioxide, to bind chemical contaminants such as poisons, acids, bases and mineral oils can be advantageous with magnetic separators respectively.  

Erfindungsgemäß können auf der Oberfläche magne­ tischer Siliciumdioxidpartikel pharmakologisch, biologisch oder biochemisch wirksame Substanzen wie z. B. Chemotherapeutika, Enzyme, Proteine, Hormone oder Antikörper gebunden, durch orale Aufnahme oder Injektion dem Organismus zugeführt werden und mit Hilfe magnetischer Hochgradientfelder am gewünschten Zielort angereichert werden. Syste­ misch bedingte Nebenwirkungen können so minimiert werden bei gleichzeitigem Erreichen hoher lokaler Wirkstoffkonzentration.According to the invention, magne on the surface table silica particles pharmacologically, biologically or biochemically active substances such as B. chemotherapeutic agents, enzymes, proteins, Hormones or antibodies bound by oral Intake or injection fed to the organism and with the help of magnetic high gradient fields be enriched at the desired destination. System Mixed side effects can be minimized become more local while reaching high Drug concentration.

Die Absorption und Bindung bestimmter Molekülgruppen, das hydrophobe oder hydrophile Verhalten sowie die Desorption der Wirkstoffe kann durch geeignete Maßnahmen wie den Ersatz freier Silanolgruppen auf der Oberfläche des magnetischen Siliciumdioxids variiert werden.The absorption and binding of certain groups of molecules, the hydrophobic or hydrophilic behavior as well the desorption of the active ingredients can be carried out by suitable Measures such as the replacement of free silanol groups on the surface of the magnetic silica can be varied.

Die Kopplung radioaktiver Isotope auf der Oberfläche magnetischer Siliciumdioxidpartikel kann durch lokale Anreicherung für diagnostische oder thera­ peutische Anwendungen wie der lokalen Strahlenthera­ pie, der Neutroneneinfangtherapie oder zur Erstellung von Szintigrammen genutzt werden.The coupling of radioactive isotopes on the surface magnetic silicon dioxide particles can by local enrichment for diagnostic or thera therapeutic applications such as the local radiation therapy pie, neutron capture therapy or to create can be used by scintograms.

Erfindungsgemäß können jod- oder bariumhaltige Röntgenkontrastmittel auf der Oberfläche magnetischer Siliciumdioxidpartikel gebunden und durch Anreiche­ rung in abzubildenen Arealen hohe Kontrastmittelkon­ zentration bei gleichzeitiger Entlastung des übrigen Organismus erreicht werden.According to the invention can contain iodine or barium X-ray contrast media on the surface of magnetic Silicon dioxide particles bound and by enrichment high contrast medium concentration in the areas to be imaged concentration while relieving the rest of the burden Organism can be achieved.

Da magnetisches Siliciumdioxid eine höhere Dichte als biologisches Gewebe aufweist, kann dieses hinsichtlich seiner lokalen Anreicherungsmöglichkeit für die Ultraschalldiagnostik Anwendung finden.Because magnetic silica has a higher density has as biological tissue, this can regarding its local enrichment possibility find application for ultrasound diagnostics.

Erfindungsgemäß können magnetische Siliciumdioxid­ partikel zur Erhöhung bei bildgebenden NMR-Diagnos­ tikverfahren angewendet werden.According to the invention, magnetic silicon dioxide  particles to increase in imaging NMR diagnosis tic procedures are applied.

Die Kopplung der Partikel mit gewebsspezifischen Bindungssubstanzen wie z. B. Antikörpern, Antigenen oder Proteinen und deren Affinität zu z. B. malignen Zellen ermöglicht über NMR- oder Ultraschalldiagnos­ tikverfahren das Auffinden von erkrankten Arealen wie z. B. Tumoren oder deren Metastasen.The coupling of the particles with tissue-specific Binding substances such as B. antibodies, antigens or proteins and their affinity for e.g. B. malign Cells enabled via NMR or ultrasound diagnostics technique to find diseased areas such as B. tumors or their metastases.

Durch gemeinsames Einbinden von jod- oder bariumhal­ tigen Verbindungen und magnetischen Substanzen in die Matrix von Siliciumdioxidpartikeln und deren Oberflächenbeschichtung mit gewebsspezifischen Bindungssubstanzen wird die gleiche Anwendung durch röntgendiagnostische Methoden ermöglicht. Erfindungsgemäß können magnetische Siliciumdioxid­ partikel in -vitro bestimmte Zellsorten, biologische Inhaltsstoffe oder DNA-Sequenzen für therapeutische oder diagnostische Zwecke isolieren, indem auf der Oberfläche biologische oder biochemisch aktive Substanzen aufgebracht und durch externe Magnetfelder abgeschieden werden.By integrating iodine or barium hal together compounds and magnetic substances into the matrix of silicon dioxide particles and their surface coating with tissue-specific Binding substances will have the same application made possible by X-ray diagnostic methods. According to the invention, magnetic silicon dioxide particles in-vitro specific cell types, biological Ingredients or DNA sequences for therapeutic or isolate diagnostic purposes by the surface is biologically or biochemically active Substances applied and by external magnetic fields be deposited.

Magnetische Siliciumdioxidpartikel können zur Bindung toxischer Stoffe, Bakterien oder Viren im Körper Anwendung finden. Die auch mit Komplexbil­ dnern wie z. B. Polykarbonsäuren und biologischen oder biochemischen Bindungssubstanzen wie z. B. Antikörper, Antigene, Hormone oder Proteine zu beschichtenden magnetischen Siliciumdioxidpartikel können über Gefäßkanulierungen außerhalb des Körpers durch Magnetfilter abgeschieden werden.Magnetic silicon dioxide particles can Binding of toxic substances, bacteria or viruses find application in the body. The one with complex bil thinners such as B. polycarboxylic acids and biological or biochemical binding substances such as. B. Antibodies, antigens, hormones or proteins too coating magnetic silica particles can via vascular cannulations outside the body be separated by magnetic filters.

Claims (17)

1. Magnetisches polymeres Siliciumdioxid in Form von Kieselgelen, Kieselsolen und gefälltem oder pyrogenen Siliciumdioxid gekennzeichnet durch die Einbindung magnetischer Materialen wie Fe, αFe2O3, γFe2O3, FeO4 in die Matrix der Siliciumdioxidverbindungen.1. Magnetic polymeric silicon dioxide in the form of silica gels, silica sols and precipitated or pyrogenic silicon dioxide characterized by the inclusion of magnetic materials such as Fe, α Fe 2 O 3 , γ Fe 2 O 3 , FeO 4 in the matrix of the silicon dioxide compounds. 2. Verfahren zur Herstellung magnetischer polymerer Siliciumdioxidverbindungen nach Anspruch 1 dadurch gekennzeichnet, das die magnetischen Materialen in Alkalisilikatlösungen wie Kalium-, Natrium- oder Aluminiumsilikatlösungen dispergiert oder als kolloidale Lösung hinzugegeben werden und mit Mineralsäuren oder Kohlendioxid gefällt und kondensiert werden.2. Process for producing magnetic polymer Silicon dioxide compounds according to claim 1 thereby featured the magnetic materials in alkali silicate solutions such as potassium, sodium or dispersed aluminum silicate solutions or be added as a colloidal solution and precipitated with mineral acids or carbon dioxide and be condensed. 3. Verfahren zur Herstellung magnetischer polymerer Siliciumdioxidverbindungen nach Abspruch 1 dadurch gekennzeichnet, daß magnetische Eisenoxide in Mineralsäuren gelöst und diese zur Fällung und Kondensation der Alkaisilikatlösungen verwendet werden.3. Process for producing magnetic polymer Silicon dioxide compounds according to claim 1 thereby characterized in that magnetic iron oxides in Mineral acids dissolved and for precipitation and Condensation of the alkali silicate solutions used become. 4. Verfahren zur Herstellung magnetischer polymerer Siliciumdioxidverbindungen nach Anspruch 1 dadurch gekennzeichnet, daß magnetische Kieselsole aus in Alkalisilikatlösungen dispergierten magnetischen Partikeln oder durch Zugabe kolloidaler magnetischer Lösungen und anschließender Fällung und Kondensation durch Kationentauscher, durch Zugabe von Mineral­ säuren oder durch Wasserentzug mit wasserlöslichen organischen Lösungsmitteln hergestellt werden. 4. Process for producing magnetic polymer Silicon dioxide compounds according to claim 1 thereby characterized in that magnetic silica sols Magnetic dispersed in alkali silicate solutions Particles or by adding colloidal magnetic Solutions and subsequent precipitation and condensation by cation exchangers, by adding mineral acids or by dehydration with water-soluble organic solvents.   5. Verfahren zur Herstellung magnetischer pyrogener Siliciumdioxidverbindungen nach Anspruch 1 dadurch gekennzeichnet, daß Siliciumtetrachlorid gemeinsam mit magnetischen Suspensionen oder kolloidalen magnetischen Lösungen in einer Wasserstoffflamme verdüst werden.5. Process for producing magnetic pyrogenic Silicon dioxide compounds according to claim 1 thereby characterized in that silicon tetrachloride together with magnetic suspensions or colloidal magnetic solutions in a hydrogen flame be atomized. 6. Magnetische polymere Siliciumdioxidpartikel nach Anspruch 1-5, dadurch gekennzeichnet, daß die spezifischen Oberflächen von 30-800 m2/g sowie die darauf befindlichen Silanol- und Siloxan- Gruppierungen, die für die Chemisorption über Wasserstoffbrückenbindung verantwortlich sind, durch den Einbau magnetischer Materialen nicht beeinträchtigt werden.6. Magnetic polymeric silicon dioxide particles according to claims 1-5, characterized in that the specific surfaces of 30-800 m 2 / g and the silanol and siloxane groups thereon, which are responsible for chemisorption via hydrogen bonding, by the incorporation of magnetic Materials are not affected. 7. Magnetische polymere Siliciumdioxidverbindungen nach Anspruch 1-5, dadurch gekennzeichnet, daß durch vollständigen oder teilweisen Ersatz durch Alkylsilylreste, so z. B. mit Chlorsilane, ein hydrophobes Verhalten, andere Bindungsaffinitäten sowie die Desorption von auf der Oberfläche des Siliciumdioxids gebundenen Substanzen verändert werden kann.7. Magnetic polymeric silicon dioxide compounds according to claims 1-5, characterized in that by full or partial replacement by Alkylsilyl radicals, e.g. B. with chlorosilanes hydrophobic behavior, other binding affinities as well as the desorption of on the surface of the Silicon-bound substances changed can be. 8. Magnetische Siliciumdioxidverbindungen nach Anspruch 1-7, dadurch gekennzeichnet, daß diese zur Reinigung, Trennung, Verteilung, Anreicherung oder für den Ein- und Austrag für Stofftrenn- und Gewinnungsverfahren, Trocknungsprozessen, als Katalysatorträger oder im Bereich der Biotech­ nologie Anwendung finden.8. Magnetic silica compounds after Claims 1-7, characterized in that this for cleaning, separation, distribution, enrichment or for the entry and exit for material separation and recovery processes, drying processes, as a catalyst carrier or in the field of biotech technology. 9. Magnetisches polymeres Siliciumdioxid nach Anspruch 1-7, dadurch gekennzeichnet, daß deren Schüttdichte durch Magnetfelder beeinflußt werden kann.9. Magnetic polymeric silica after Claims 1-7, characterized in that their  Bulk density can be influenced by magnetic fields can. 10. Magnetische Siliciumdioxidverbindungen nach Anspruch 1-7, dadurch gekennzeichnet, daß diese zur Bindung von Chemikalien ausgebracht und mit magnetischen Separatoren aufgenommen werden können.10. Magnetic silica compounds after Claims 1-7, characterized in that this applied to bind chemicals and with magnetic separators can be added. 11. Magnetische Siliciumdioxidverbindungen nach Anspruch 1-7, dadurch gekennzeichnet, daß deren Oberfläche mit pharmakologisch, biologisch oder biochemisch wirksamen Substanzen beschichtet, oral oder durch Injektion dem Organismus zugeführt und mit magnetischen Hochgradientfeldern lokal angereichert werden können.11. Magnetic silicon dioxide compounds after Claims 1-7, characterized in that their Surface with pharmacological, biological or coated with biochemically active substances, supplied to the organism orally or by injection and with magnetic high gradient fields locally can be enriched. 12. Magnetische polymere Siliciumdioxidverbindungen nach Anspruch 1-7, dadurch gekennzeichnet, daß auf deren Oberfläche radioaktive Isotope aufgebracht und lokal angereichert werden können.12. Magnetic polymeric silicon dioxide compounds according to claims 1-7, characterized in that radioactive isotopes applied to their surface and can be enriched locally. 13. Magnetische Siliciumdioxidverbindungen nach Anspruch 1-7, dadurch gekennzeichnet, daß auf deren Oberfläche Röntgenkontrastmittel aufgebracht und durch Magnetfelder lokale Anreicherungen im Organismus erzielt werden können.13. Magnetic silica compounds after Claims 1-7, characterized in that on X-ray contrast media applied to their surface and local enrichment through magnetic fields can be achieved in the organism. 14. Verfahren zur Herstellung magnetischer Silici­ umverbindungen nach Anspruch 1-7, dadurch gekennzei­ chnet, daß in deren Matrix magnetische Materialen und Röntgenkontrastmittel eingebunden werden.14. Process for the production of magnetic silicon re-connections according to claims 1-7, characterized chnet that in their matrix magnetic materials and X-ray contrast media can be integrated. 15. Magnetische Siliciumdioxidverbindungen nach Anspruch 1-7, dadurch gekennzeichnet, daß diese zur Kontrasterhöhung bei bildgebenden Ultraschall und NMR-Diagnostikverfahren Anwendung finden. 15. Magnetic silicon dioxide compounds after Claims 1-7, characterized in that this for increasing contrast in imaging ultrasound and NMR diagnostic methods find application.   16. Magnetische Siliciumdioxidverbindungen nach Anspruch 1-7, dadurch gekennzeichnet, daß diese auf der Oberfläche mit biologisch oder biochemisch aktiven Substanzen beschichtet und zur Isolierung von Zellen, biologischen Inhaltsstoffen oder DNA-Sequenzen mit Magnetfeldern verwendet werden können.16. Magnetic silicon dioxide compounds after Claims 1-7, characterized in that this on the surface with biological or biochemical active substances coated and for insulation of cells, biological ingredients or DNA sequences with magnetic fields can be used can. 17. Magnetische Siliciumdioxidverbindungen nach Anspruch 1-7, dadurch gekennzeichnet, daß diese zum extra- oder intrakorporalen Austrag oder Bindung von biologischen Inhaltsstoffen, toxischen Substanzen, Bakterien oder Viren aus dem Organismus mit Hilfe von Magnetfeldern verwendet werden können.17. Magnetic silica compounds after Claims 1-7, characterized in that this for extra or intracorporeal discharge or Binding of biological ingredients, toxic Substances, bacteria or viruses from the organism can be used with the help of magnetic fields can.
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